Try checking your "recently deleted tasks" list in your account settings. This will tell you if any tasks were deleted and why. If you ever let your subscription expire, or temporarily set the "delete completed tasks" preference lower, it will delete the old tasks based on the new setting.

I am also a pro user and cannot locate recently completed tasks. just b/c they're completed doesnt' mean we don't need to reference them anymore. I check your posting above and there is no "recently deleted tasks" in the acct settings.

That's it. My company recently started using toodledo but instead of expanding use to other departments we are going to discontinue use if this isnt resolved. My manager has requested assistancce with this multiple times to no avail.

@lbgpdb
I think you are confusing deleted tasks with completed tasks. The "Recently deleted tasks" link is in your account settings on the left hand side, the 4th link down. This list will show tasks that were deleted. To view tasks that were completed, you go somewhere else. This will explain how to find completed tasks: http://www.toodledo.com/info/help.php?sel=86

I do not recall being contacted by your manager multiple times about completed tasks. Please ask him/her to create a support ticket for assistance with any problems they may have with their account.

Your settings were probably set to "6 months" at some point in the past which would have caused them to be deleted. Changing it from "6 months" to "2 years" cannot undelete previously deleted tasks.

You can always look at your "recently deleted tasks" list in your account settings to see if tasks were deleted. If you are certain that this doesn't apply to you, please open a support ticket and we will investigate further.

1- I won't change my settings.
2- I'll make a note of what completed tasks I'm able to see today. Just looked: 2011-07-12! (Funny, eh: exactly SIX MONTHS ago)!!!
3- I'll put a reminder to check tomorrow.
4- If the completed tasks I'm able to see are not the same, I'll get back to this post.

So, okay, im on the free account but I can't find any task hidden in last 6 month with the tool Search. Well, when i saw comments, its seems to be a problem for many customers...

in Search tool i only add checked Off YES. but I find only hidden task completed in the last week. all others taks are deleted... do i understand they are kept 6 months, and all are erased after 6 months (deletion in january and july) .. or, its deleted month per month, after 6 month (would be smarter)..

If you are on a free account, your history is limited to 1 week of viewable tasks, but we will keep up to 6 months in case you upgrade to a Pro account. With a Pro account, you can view your entire history.

@mfluka Please let us know what you find. You can create a support ticket for faster service.

I recently had the problem of a completed task disappearing - oddly enough, it was still visible on my iPhone app, fortunately, as I hadn't invoiced for the job and would otherwise have forgotten! I don't want to upgrade, so I've now created a folder for completed tasks. Everything that's been completed but can't yet be deleted gets a negative priority and is dumped in the "completed" folder, but NOT ticked. Hopefully that will solve the problem.